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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Yelverton, F. H. |
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| Author Affiliation: | Department of Crop Science, North Carolina State University, Raleigh, NC |
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| Title: | Effects of trinexapac-ethyl and paclobutrazol on ball roll and summer stress of creeping bentgrass |
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| Meeting Info.: | 51st Annual Meeting, Birmingham, AL, January 26-28, 1998 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 51, 1998, p. 68. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Plant growth regulators; Trinexapac-ethyl; Paclobutrazol; Ball roll distance; Heat stress; Agrostis stolonifera; Golf greens; Root weight; Mowing height; Golf green speed
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| Abstract/Contents: | "Plant growth regulators (PGRs) that inhibit gibberellic acid biosynthesis are commonly used in creeping bentgrass putting greens to manage annual bluegrass (Poa annua ssp. annua & reptans) and improve putting quality. By inhibiting growth of annual bluegrass more than bentgrass, a competitive shift in favor of bentgrass can be achieved by repeated use of the PGR. Because bentgrass undergoes heat stress and root decline in the summer, any effect on bentgrass root growth would be important. This research evaluated the use of paclobutrazol at 0.14, 0.28, and 0.6 kg ai/ha and trinexapac-ethyl at 0.05 kg ai/a applied monthly from April to December to creeping bentgrass mowed at 3.2, 4, and 4.8 mm. A split plot design was used with mowing height as the whole plot and PGRs as subplots. This experiment was conducted at the Sandhills Turfgrass Research Lab near Jackson Springs, NC and a two year 'Penncross' creeping bentgrass stand. The soil was 94% sand, 4% silt, and 2% clay. PGRs were applied every four weeks and plots were fertilized on the same date and thiophanate-methyl was applied as needed for disease control. Stimp readings were recorded monthly by taking three measurements in each of two directions for a total of six measurements per plot. Root weights were recorded monthly by pulling tow cores/plot with a golf green cup cutter. Soil was removed from samples via a root wash. Root samples were dried, weighed, ashed, and weighed again. Root weights were determined by the difference in pre and post ashing weights. PGRs did not affect bentgrass root weights in eight of nine sampling dates. For the September sampling date, trinexapac-ethyl had higher roots weights than nontreated plots but this difference appeared transient because it disappeared on the next sampling date. A PGR* mowing height interaction occurred at the late October sampling date. Paclobutrazol treatments had lower bentgrass root weights at the 3.2 mm mowing height. This lower weight appeared to be caused by paclobutrazol delaying the onset on bentgrass root growth during a period when new root growth was being initiated. This difference also appeared to be short-lived because no differences were found at the November sampling date. PGRs did not affect putting green speed. Mowing height had a significant effect on putting green speed. When mowing height increased, putting green slowed by approximately 30 cm for each increase in mowing height." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: Summertime Blues
Other items relating to: P G Rs 1997-2006 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Yelverton, F. H. 1998. Effects of trinexapac-ethyl and paclobutrazol on ball roll and summer stress of creeping bentgrass. South. Weed Sci. Soc. Proc. 51:p. 68. |
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MSU catalog number: SB 611 .S6 v.51 |
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